EMS Registry ReadyExample 1 · lead II · 6 seconds
- Rate
- 35/min3 QRS complexes in 6 seconds × 10 = 30/min
- Rhythm
- Regular
- P waves
- Upright in II, uniform
- P to QRS
- 1:1, a P before every QRS
- PR
- 0.19 s
- QRS
- 0.09 s, narrow
Sinus bradycardia on an ECG strip
Everything normal sinus rhythm has, but under 60/min.
What to look for
Sinus rhythm below 60/min. Everything about it is normal sinus rhythm except the rate.
Examples
Each strip is 6 seconds of lead II, drawn to scale (25 mm a second, 10 mm a millivolt), so you can count boxes the way you would on paper. Each one is a different example, measured below it.
Example 2 · lead II · 6 seconds
- Rate
- 49/min5 QRS complexes in 6 seconds × 10 = 50/min
- Rhythm
- Regular
- P waves
- Upright in II, uniform
- P to QRS
- 1:1, a P before every QRS
- PR
- 0.20 s
- QRS
- 0.10 s, narrow
Example 3 · lead II · 6 seconds
- Rate
- 31/min3 QRS complexes in 6 seconds × 10 = 30/min
- Rhythm
- Regular
- P waves
- Upright in II, uniform
- P to QRS
- 1:1, a P before every QRS
- PR
- 0.14 s
- QRS
- 0.08 s, narrow
Don't confuse it with
- Normal sinus rhythm
Regular at 60-100/min, an upright P before every QRS, a PR of 0.12-0.20 s and a narrow QRS.
- Third-degree (complete) AV block
P waves and QRS complexes each regular but unrelated: no P is conducted, so the PR is all over the place.
- Second-degree AV block, type II
A constant PR, then a P wave that suddenly isn't conducted. The QRS is often wide.
Want a new strip every time? The ECG Drill in the app draws a fresh, measured example on every try and steers you toward the rhythms you miss. It's part of the Paramedic level, and you can try 5 strips a day free.
Try the ECG Drill